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The dried leaf of Isatis indigotica (Brassicaceae). Cold and bitter, entering the Heart and Stomach channels. From the same plant as Ban Lan Gen (the root), it clears heat, resolves toxicity, cools the blood, and dissipates macules. Commonly used for warm disease with eruptions, sore throat, and mumps.
Reference range for non-pregnant adults. Not a personalized prescription. Pregnancy, lactation, and pediatric use require specialist supervision.
Protective guidance only — when to avoid or use with caution. This block deliberately omits pregnancy, lactation, and pediatric dosing: any such use must be managed by a qualified TCM practitioner or appropriate specialist.
（时珍曰）大青气寒味微苦咸，能解心胃热毒，故治伤寒大热狂躁阳毒之疾。
草部
@misc{bencaodian-da-qing-ye,
author = {{Bencaodian Editorial}},
title = {Dà Qīng Yè 大青叶 (Isatis Leaf) — Isatidis Folium},
year = {2026},
howpublished = {Bencao Dian: A Bilingual Knowledge Graph of Traditional Chinese Medicine},
url = {https://bencaodian.org/en/herbs/da-qing-ye},
urldate = {2026-04-17},
note = {CC BY-SA 4.0}
}© Bencaodian Editorial · Licensed under CC BY-SA 4.0
大青叶富含靛蓝、靛玉红及色胺酮等吲哚类成分，具抗病毒、抗菌、抗炎和抗白血病细胞作用。
Da Qing Ye contains indigo, indirubin, and tryptanthrin indoles with antiviral, antibacterial, anti-inflammatory, and antileukemic activities.
大青叶苦寒，清热解毒，凉血消斑。
Bitter-cold; clears heat, resolves toxin, cools blood, and eliminates maculopapular eruptions.
This section is provided for academic reference only and does not constitute medical advice.